Coupled Transient Electromagnetic-thermal Fields Analysis of Medium-frequency Transformer [中频变压器瞬态电磁场-温度场耦合求解分析]

作者：Chen B.^*; Liang X.; Wan N.; Tang B.; Huang L.

来源：High Voltage Engineering, 2020, 46(12): 4400-4409.

DOI：10.13336/j.1003-6520.hve.20200302025

• Core loss
• Medium-frequency transformer
• Phase shift control
• Temperature field
• Winding loss

Magnetically coupled DC-DC converter based on medium-frequency transformer (MFT) is the key equipment for realizing large-scale DC source interconnection and MW-level DC voltage conversion. However, the high power density and high frequency will increase the temperature rise of MFT. In order to obtain the temperature field of MFT under non-sinusoidal excitation accurately, the effects of temperature on magnetization and loss properties of nanocrystalline alloys are taken into consideration, and the coupled transient electromagnetic-thermal fields method is used to simulate the core loss, winding loss, temperature field of a 200 kVA/10 kHz nanocrystalline core MFT under no-load and short-circuit conditions. The simulated values are compared with the measured values, and the results show that the relative deviations of core loss, winding loss, maximum temperature rise are 8.08%, 0.63%, and 8.19%, respectively. Finally, the loss and temperature rise of the MFT under the phase shift control mode are calculated, which is essential for the structure and heat dissipation design of the high power density MFT.

• 出版日期2020
• 单位三峡大学